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Many thanks to you both for helpful suggestions.
Hans - I wasn't aware of the HP system Print and Scan doctor, brilliant! I have saved it and run programme and it all seems to be printing fine now. I am hoping that it will also cure another problem I have with printing off pdf files, intermittently they print off all gobbledegook - strange language! Its unpredictable when it happens, so fingers crossed it has cured this too! Many thanks Hans!